against

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Concise Oxford English Dictionary © 2008 Oxford University Press:
against /əˈgɛnst, əˈgeɪnst/
preposition
  • 1 in opposition to.

    ■ in resistance to.

  • 2 in anticipation of and preparation for (a difficulty).

    ■ (in betting) in anticipation of the failure of: the odds were 5–1 against England.

  • 3 in relation to (money owed, due, or lent) so as to reduce, cancel, or secure it.
  • 4 in or into contact with.
  • 5 in contrast to.
– phrases
have something against dislike or bear a grudge against.
– origin ME: from again + -s (adverbial genitive) + -t, prob. by assoc. with superlatives (as in amongst).
'against' also found in these Oxford entries:

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